Cold-bending molding technology and production line for producing broad width U-shaped channel steel

Abstract

The invention provides a cold-bending molding technology and a production line for producing a broad width U-shaped channel steel. The technology comprises the following steps: 1) sheets are pinched synchronously; 2) the sheets pass through a plurality of roll loading devices, the roll loading devices bend both sides of the sheet so as to make both sides of the sheet produce a bending angle alpha, and in the moving direction of the sheet, the rear roll loading device makes the bending angle alpha increased gradually to 90 degrees, so a U-shaped channel steel is initially molded; and 3) the side surface of the U-shaped channel steel initially molded is rectified. With the technology, the flat sheet can be relatively and continuously molded into the integral U-shaped broad width channel steel without welding. The production line of the technology has the advantages of no limit on the total length of the channel steel, high production efficiency, stable production quality, stable operation, low noise and the like.

Description

technical field [0001] The invention relates to a cold bending forming process and production line for producing large and wide U-shaped channel steel. Background technique [0002] The cross-sectional shape of the main girder body of the existing electric single-girder crane is mostly U-shaped, so as to ensure that the main girder body has sufficient supporting strength for the electric hoist and the lifted goods. In addition, the U-shaped channel steel used as the main girder body of the electric single-girder crane has a span of up to 20 meters and needs to bear a lot of weight, which requires a wider width on both sides of the U-shaped channel steel. Such as figure 1 As shown, the U-shaped channel steel with a wider format refers to the U-shaped channel steel with a larger ratio between the side height H' and the bottom width D'. As a U-shaped channel steel for the main girder body of a single-beam crane, the above ratio Usually 1:1 to 3:1. There are usually two metho...

AI Technical Summary

Problems solved by technology

However, the production efficiency of this method is low, and the channel steel is prone to "left-right asymmetry", and problems such as "cannot be spliced" will be caused by positioning accuracy errors between the channel steel sections.

Moreover, the production process has high requirements on welding quality, the welding process is seriously polluted, and the labor intensity of workers is high during handling.

[0005] In summary, the above two production methods are not suitable for the production of wide U-shaped channel steel with long length

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